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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.17: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Single photons slowed down by cesium-vapour — •Lucas Bremer¹, Alexander Thoma¹, Max Strauß¹, Sarah Fischbach¹, Sven Rodt¹, Tobias Heindel¹, Jin-Dong Song², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, TU Berlin, Berlin, Germany — ²Center for Opto-Electronic Materials and Devices, KIST, Seoul, Korea

Semiconductor quantum dots (QDs) proved to be close to ideal emitters of single and indistinguishable photons, which can be further combined with deterministic device fabrication technology [1]. Atomic vapours in contrast can be used to slow down photons spectrally in resonance with their absorption lines [2]. Thus, hybrid systems interfacing single photons from a quantum dot with atoms show promise for the storage of quantum information [3]. In this work we investigate the temporal delay introduced by the high dispersion of the excited state hyperfine resonances of cesium-vapour, which is a crucial step towards the realization of quantum memories. Tuning the QD emission into the atomic resonance we are able to study the amount of photons delayed by the atoms. Increasing the temperature of the cesium-vapour enables us to observe a maximum delay of τ = (11.4 ± 0.5) ns.
[1] Gschrey et al., Nat. Commun. 7662, 6 (2016)

[2] Akopian et al., Nat. Photonics 5, 230 (2010)

[3] Chanelière et al., Nature 438, 833 (2005)